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Pulsed Redistribution of a Contaminant Following Forest Fire

Cesium-137 in Runoff

^a 528 35th Street, Los Alamos, NM 87544
^b Department of Radiological Health Sciences, Colorado State University, Fort Collins, CO 80523
^c Earth and Environmental Sciences Division, Los Alamos National Laboratory, Mail Stop J495, Los Alamos, NM 87545

View larger version (40K): [in a new window]   Fig. 1. Study locations are shown within the Pajarito Watershed (shaded) including the approximately 480-ha upper watershed area (dashed line) that contributed to stormwater runoff measurements. New Mexico State Road 4 is shown. The community of Los Alamos, New Mexico is located approximately 3 km northeast of the study area.

View larger version (18K): [in a new window]   Fig. 2. Cesium-137 concentrations in the upper 50 mm of soil (before and after wildfire), unburned litter, and post-fire ash. Data modes are shown within the 25th to 75th percentile boxes. Whisker bars show standard deviation and outlier data are shown as points where present [ash data is from New Mexico Environment Department; pre-fire soils data from Los Alamos National Laboratory (2001)].

View larger version (18K): [in a new window]   Fig. 3. Concentrations of 137Cs and total suspended solids in runoff (r = 0.95).

View larger version (18K): [in a new window]   Fig. 4. Post-fire concentrations of 137Cs in unfiltered runoff during cumulative rainfall.

View larger version (22K): [in a new window]   Fig. 5. Sediment yields and 137Cs yields from rainfall simulations on burned and unburned plots over a range of vegetation types (sediment yield data from Johansen et al., 2001a,b).

View larger version (20K): [in a new window]   Fig. 6. Enrichment ratios in runoff sediments from rainfall simulation in a range of ecosystem types. Data modes are shown within the 25th to 75th percentile boxes. Whisker bars show standard deviation and outlier data are shown as points where present.